Intubate: To put a tube in, commonly used to refer to the insertion of a breathing tube into the trachea for mechanical ventilation. For example, as a life-saving measure, an emergency room physician might intubate a patient who is not breathing adequately so that the lungs can be ventilated.
Flying time from JFK to SFO. The total flight duration from JFK to SFO is 5 hours, 46 minutes. This is the average in-air flight time (wheels up to wheels down on the runway) based on actual flights taken over the past year. It covers the entire time on a typical commercial flight including take-off and landing.
The distance from JFK in New York to LHR London is 1.39 times more distant than Glenn's Los Angeles to New York flight. Therefore extrapolating, John Glenn would have flown from New York to London in 4 hours and 42 minutes. The F-22 would fly the same distance in even less time if it flew supersonic as Glenn did.